David Walsh Blog
Node EADDRINUSE (Address Already in Use) Error
![Node EADDRINUSE (Address Already in Use) Error]()
Every once in a while my Macbook Pro freaks out and a process goes rogue. This oftentimes happens when I'm working on the excellent debugger.html project; I attempt to start the server side of the debugger and suddenly I'm hit with an error that resembles the...
![How to Play Sony Playstation Games on OpenEmu]()
How to Play Sony Playstation Games on OpenEmu
I've been having the time of my life playing retro Nintendo64, NES, SNES, and Game Gear games since I discovered OpenEmu. I bought a few USB Nintendo 64 controllers and I'm like a kid again, even sharing that joy with my two young children. Using...
![Detect Supported Audio Formats with JavaScript]()
Detect Supported Audio Formats with JavaScript
As streaming becomes our main entertainment source and vendors fight to create the best video format, it's going to be more and more important that we detect device and browser video support before posting videos on our websites. We think less about audio but the same...
![Better Debugging with Conditional Breakpoints]()
Better Debugging with Conditional Breakpoints
I love conditional breakpoints. Really! They're my favorite debugging tool. When I got started in web development, "debugging" for me meant creating a
<pre id='log'></pre>and appending strings to its contents to act as a log. But once Firebug rolled around—and then when browsers started...![Top Prototyping Tools You Should Consider Using]()
Top Prototyping Tools You Should Consider Using
Knowledgeable designers constantly check with clients and other team members for feedback. Also, they always seek assurances their design is moving in the right direction. Prototypes offer one effective way of sharing design information with others. They also serve as a self-check. They make detection and...
![Split Files Into Smaller Files]()
Split Files Into Smaller Files
As fast as internet connections have gotten over the years, it seems the size of files we want to share has grown faster. Whether it's archive (ZIP), video, or any other host of potentially large file types, it's still tricky to put these large files somewhere...
![Image and Video Conversion with Cloudinary]()
Image and Video Conversion with Cloudinary
I've always been fascinated with media formats and converting both images and video from one format to another. Media conversion allows us to play videos on devices or apps with picky media requirements and load optimized formats for faster download speed. I've written several media-related...
![Show git Branch from Command Line]()
Show git Branch from Command Line
Whether it's simply submitting pull requests or being snobby enough to use vim as a text editor, web developers and designers spend an awful lot of time working from command line. If you do work with git, you know it's important to keep track of your branches...
![Contest: Cloudinary Style Transfer on CodePen!]()
Contest: Cloudinary Style Transfer on CodePen!
Cloudinary provides web designers and developers the ability to do a huge number of operations, like resize, optimize, and format almost all media types, but my favorite parts of their service are the vast amount of visual transformations their API allows you to play with; ...
![The Advantages of Using a Design to WordPress Service and Four Great Options]()
The Advantages of Using a Design to WordPress Service and Four Great Options
You've taken a cool idea and transformed it into an awesome design that's ready to take the world by storm. However, there is one thing that is left to do - converting it to code. You could, of course, take the easy route and use a...
Popular Features
![How to Create a RetroPie on Raspberry Pi – Graphical Guide]()
How to Create a RetroPie on Raspberry Pi – Graphical Guide
Today we get to play amazing games on our super powered game consoles, PCs, VR headsets, and even mobile devices. While I enjoy playing new games these days, I do long for the retro gaming systems I had when I was a kid: the original Nintendo...
![Conquering Impostor Syndrome]()
Conquering Impostor Syndrome
Two years ago I documented my struggles with Imposter Syndrome and the response was immense. I received messages of support and commiseration from new web developers, veteran engineers, and even persons of all experience levels in other professions. I've even caught myself reading the post...
![Being a Dev Dad]()
Being a Dev Dad
I get asked loads of questions every day but I'm always surprised that they're rarely questions about code or even tech -- many of the questions I get are more about non-dev stuff like what my office is like, what software I use, and oftentimes...
![JavaScript Promise API]()
JavaScript Promise API
While synchronous code is easier to follow and debug, async is generally better for performance and flexibility. Why "hold up the show" when you can trigger numerous requests at once and then handle them when each is ready? Promises are becoming a big part of the JavaScript world...
![7 Essential JavaScript Functions]()
7 Essential JavaScript Functions
I remember the early days of JavaScript where you needed a simple function for just about everything because the browser vendors implemented features differently, and not just edge features, basic features, like
addEventListenerandattachEvent. Times have changed but there are still a few functions each developer should...![I’m an Impostor]()
I’m an Impostor
This is the hardest thing I've ever had to write, much less admit to myself. I've written resignation letters from jobs I've loved, I've ended relationships, I've failed at a host of tasks, and let myself down in my life. All of those feelings were very...
![fetch API]()
fetch API
One of the worst kept secrets about AJAX on the web is that the underlying API for it,
XMLHttpRequest, wasn't really made for what we've been using it for. We've done well to create elegant APIs around XHR but we know we can do better. Our effort to...
